﻿using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

/// <summary>
///Encry 的摘要说明
/// </summary>
public class Encryption
{
    //加密解密私钥
    const string KEY_64 = "Jumpton123";
    const string IV_64 = "Jumpton456";


    ///// <summary>
    ///// 对字符串加密
    ///// </summary>
    ///// <param name="data">加密字符串</param>
    ///// <returns></returns>
    //public static string Encode(string data)
    //{
    //    byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
    //    byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

    //    DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
    //    int i = cryptoProvider.KeySize;
    //    MemoryStream ms = new MemoryStream();
    //    CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey,
    //        byIV), CryptoStreamMode.Write);

    //    StreamWriter sw = new StreamWriter(cst);
    //    sw.Write(data);
    //    sw.Flush();
    //    cst.FlushFinalBlock();
    //    sw.Flush();
    //    return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
    //}

    /// <summary>
    /// 对字符串进行解密
    /// </summary>
    /// <param name="data">解密字符串</param>
    /// <returns></returns>
    public static string Decode(string data)
    {
        byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
        byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

        byte[] byEnc;
        try
        {
            byEnc = Convert.FromBase64String(data);
        }
        catch
        {
            return null;
        }

        DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
        MemoryStream ms = new MemoryStream(byEnc);
        CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey,
            byIV), CryptoStreamMode.Read);
        StreamReader sr = new StreamReader(cst);
        return sr.ReadToEnd();
    }
}
